I know Bushnell just came out with a Rangefinder Scope to go up against the Burris Eliminator, but I don't know of anybody who has one, to give an honest assessment about them.
However, for around the 800-$900 for these Scopes, I would just get a great $500 scope, w/BDC that will last a Lifetime, and get a separate Rangefinder for $300 and spend the last $100 on Ammo(if you can find it) to play with, but that's me.

the draw back is that the FOV is so small in a scope that it is not very effective as a range finder. Plus when you take two very specialized items like this and combine them what you get is something that can do two thing's OK but not good or great.